Measured-service automatic telephone system



P. C. SMITH MEASURED SERVICE AUTOMATIC TELEPHONE SYSTEM June 16, 1925.

Filed June 20, 1922 2 Sheets-Sheet 1 hvefllbk Percy Cf 8/77/92 k RIQ &

' June 16, 1925.

P. C. SMITH I MEASURED SERVICE AUTOMATIC TELEPHONE SYSTEM 2 Sheets-Sheet 2 MHH W Filed Juno 2Q, 1922 bye/775x.- Percy Cf Sm/777.

Patented June 16, 1925.

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Toiall whom it'may concern:

'Be it known that I PERCY GLeYTON SMITH, a citi zen of the United States of America, residing at East Orange, in the 5 county of Essex, State of'New Jersey, have invented certain new and useful Improvements in Measured-Service Automatic Tele-' phone Systems, of which the following full, clear,-concise, and exact description.

This invention relates to automatic telephone systems andwmore specifically to a metering circuit arrangement for systems 015 this character.

The object of the invention is to provi d an ilnproved circuit arrangement for automatically operatlngthe calling line meter on: ordinary calls upon the completionot the connection,and for preventing the operation of the calh nnr line meter on so-called pahtments, etc

In accordance wlth this invention, these freelines are grouped ma 'certain level or a circuit change inthe calling lin'e' to cause the meter to record the call, biit i f such connector isset on' any other level in connecting with-an ordinary l ne, th s means is notrendered activeand current is supplied to the calling hne and a circuit chan e 1s linef circuit to cause the. meter 1c record the call.

a subscriberls line,'a primary line'switch a called subsoribers line; ma. Fig. 2 shows a modified form otthe invention Grily so much1* of the circuits aneshown as is? hecessany. to comprehend theminventionp ondary "line switches are shown: in- Wicks Patentl N'ica 1,36 9',068 ,issued May- 24; 1921.

moves his recei ver to' initiate a call; circuits are. closed be opemjterv the primary and sec ondary ilinei swltchesG and: D as described in th flisflldxwiflkswpagentlliOL'QKlEBIIdQlZhQCflMk free calls; that is,on calls to oflicial's of'the telephone company, the police or fire desimultaneously Brought; aboutin. the ca ling Referring to the drawings, Fig, 1 shows seconda-ry line switch, a connector and a Complete circuits of the primary and See s l e he eee ter I i l be t id i' tod tha t we: 9 selttt Q53. e an in P a tic e, inse te b twe n t il secondary line switch the connectolr' I- Thes 5 9610153 i t bw 'de i l i t a i l Pa en a need t, hat fore; described hereiiil Upon eiteiiiQ f h a l s it f the c a t r, the m u s r ay 1 perate en rg ing htl al first slow relay 2whicli grounds the re e e trunk? leading back mthapfimar' t r t li t t i t to ieltl h t preparesa circuit for the connector yerti I l niag net 4L Theinlpulse relay responds to the tens series ofinipiilses frointhesender Sa't' the calling substation andcontrols the. vertical magnet 4' in series with slow relay 5 toset the connector wipe'i s 6 to the desired level of contacts in which are located the ccntactsto which the called line is connecta ed], We will assume that in this instance, the calledlineis not a free lihe After this series of impulses, slow relay 5 releasesto prepare the circuit for the rotary inagnet 7* afn-"d the slow rel'ay 8*throngli the new operated o'fi'norlnal switch 9. When impulse relay 1 isoperatedfl for the units pulsesfrom the sendenS the rotary 7 is operated to step the'wipers tdthe'pon tacts of the desired line, and slow to release" relay 8 energizes and je mains energized fora shqrt intervaliafter' the 'wipe r reach the called line terminals; If the calle line ishusy, a ground will" he present the; test conductor 10' thereof'and a circt l itwill" be closed thr0ugh"an alternate copta ct relay 8* for the'leusy relay T1 which will up and transniit a busy signal fron i the tone source: is; t If thetalled line'- is da e relay 11 i will not "be energ iied since no ground is resent on theKtfestf inulti 1e 10 ofthe'calle line andJas-S 'On asrtlie slow'le- T lay 8 releases after th edin'e yeri energized; wei'rcuit is close forthe upper winding ofrelay 13 in serieswith theacut-ofi' Winding 1415f the line switcho the called line: Relay mend 'said cliit o It is thought that the "amuse-n wilthe" most clearly understoodffrom udetetiled. d'e w scription oi the: openat'i'onxof' they-systems:

When: I aqqsubscn ben i atsubstation A reto the ringing circuit which leadsfrom a normal contact of relay and includes one winding of said relay and battery, so

that when the called party responds to the signal he closes an operating circuit of relay to the release conductor 19 now grounded at the inner right armature and alternate contact of the slow relay 2. The meter 18 looks up in order to prevent a second charge being made for the same call due to a possible accidental reoperation of the polarized relay 17. A non-inductive winding 20 in shunt of the polarized relay 17 provides a free path for voice current.

The circuits just traced in brief are well known as shown in the said Wicks patent. Reference will now be made to the circuits and apparatus by which applicants object is achieved. Assuming now, that a free line is called, this line will be located in a certain level of the connector switch H having a segment 21 individual thereto located in an auxiliary bank over which a brush 22 attached to the connector shaft comes to rest at the end of the vertical movement of'the connector. This results in the closure of a circuit for a relay 23. The mechanical arrangement of this switch is such that the brush 22 does not partake of the rotary movement of the connector. The connector is then set on the called line as described and the line is signaled. Then the called party removes his receiver and relay 15 operates as described. talking current is applied to the called line circuit through relay 23. When relay 23 operated, it disconnected the back bridge relay 16 from the trunk conductors 24 and 25 and consequently said relay does notoperate to reverse the current in the calling line upon the response of the called subscriber as in the case of the former call which was charged.

Upon the termination of the conversation and the restoration of the receiver by the calling party, relay 1 releases. The release of this relay opens the circuit of the slow relay 2 and the inert condition of relays 1, 2 and 16 closes the following circuit for the release magnet 26 of the connector: battery, 26, 27, 28,29, 30, 31, 32, 33 and 34' to ground. The connector brush shaft in restoring also restores the auxiliary brush 22 into connection with normal segment-35 which unlocks relay 23. The retraction of the inner right armature of slowrelay 2 removes ground from the trunk release conductor 3, leading back to the primary and secondary line switches C and D, respectively, releasing the same as described in the said Wicks patent.

substitute itself as in Fig. l, a relay 3.7 is

provided to operate in parallel with the upper winding of the back bridge relay 38 and in series with the lower winding thereof uponthe response of the called party.

Although the relay 38 operates on a call that is to be charged to reverse the direction of current flow in the calling line to operate the polarized relay 39 to in turn operate the meter'magnet 40 as described in Fig, 1, if a free level is selected by the connector brushes 41, (Fig, 2) the auxiliary brush 42 carried by the connector brush shaft in this case rests upon a segment 43 individual to this free level so that when the called subscriber removes. his receiver, relay 3? operates. The circuit of relay 37 is as follows; battery 37, 44, 43, 42, 45, 46, 47, through the called line loop, 48. 49, 50, 51, lower winding of 38, 52, 53, 54, 55, 56, and 57 to ground. The upper winding of relay 38 is connected to the lower talking conductor 45, the return being through its lower winding to ground as traced. Relay 3'? nullifies the effect of the current reversal caused by the back bridge relay 38, andin attracting its right armature locks up to the grounded conductor 55. This simultaneous operation of relays 37 and 38 will prevent reversing the direction of the current flowing in the calling line and thus prevent the operation of the polarized relay 39 and consequently this call will not be charged. The other circuits shown in Fig. 2 are identical with those shown in Fig. 1 and need not therefore be described.

-'What is claimed is:

1. In a telephone system, calling and called telephone lines, an automatic switch for interconnecting the same wherein saidcalled lines terminate'in groups, meters for said calling lines, a relay included in said switch responsive to the removal of the receiver of the called line for supplying current to the calling line of the proper character for operating the calling line meter, another relay, means for operating the same when any one of certain predetermined groups is selected by said automatic switch whereby said first mentioned relay is prevented from respondingto the'removal of Anne lit

levels for supplying the talking current to the calling line in the proper direction to operate the calling line meter, another relay,

means for operating the same when the called l1ne 1s reached over any other level of the automatic switch whereby sa1d first mentioned relay is prevented from responding to the removal of the receiver of the called line, and means for supplying the talking current to the calling line in such a direction as not to cause the operation of said meter.

3. In a telephone system, calling and called telephone lines, an automatic switch for interconnecting the same wherein said called lines terminate in groups, meters for said lines, means in the switch including a relay responsive to the removal of the re ceiver of any called line in certain of said groups for operating the meter associated with the calling line, asecond relay, means included in said automatic switch for operating the same when the called line is in any other group whereby the first mentioned relay is disabled, and means for supplying talking current to the called line.

4. In a telephone system, calling and called telephone lines, an automatic switch for interconnecting the same wherein said called lines terminate in groups, meters for said lines, means in the switch including a relay responsive to the removal of the receiver of any called line in certain of said groups for operating the meter associated with the calling line, a second relay, means included in said automatic switch for operating the same when the called line is in any other group whereby the first mentioned relay is disabled, and means for supplying talking current to the called line through the windingsof said second relay.

5. Ina telephone system, calling and called telephone lines, an automatic switch having a primary and a secondary movement for interconnecting the same wherein said called lines terminate in different levels, meters for said calling lines, means in said switch responsive to the removalof the receiver of the called line for operating the calling line meter, a commutator, a brush therefor, means responsive to the primary movement of said. switch for moving said brush over said commutator, a circuit extended Via said commutator and brush on certain switch levels, and means responsive to the closing of said circuit for rendering said meter operating means inoperative.

6. In a telephone system, calling and called telephone lines, automatic switches for interconnecting the same including a connector wherein said called lines terminate in. levels, meters forsaid calling lines,

means in said connector responsive to the removal of the receiver of the called line for causing the operation of the calling line meter, a row of terminals in said connector, a brush arrangedto engage any terminal in said .row, a relay, means including said brush and any desired terminal for operating said relay, and means responsive to the operation of said relay for rendering said meter operating means inoperative.

In witness whereof, I hereunto subscribe my name this 19th day of June A. D., 1922.

PERCY 0. SMITH. 

